The biological son of NSW Police commissioner Mick Fuller has been convicted, fined and banned from getting behind the wheel after admitting drink driving while his P-plate licence was suspended. Jacob James Fuller, 20, was charged after he blew 0.031 after pulling up short of a roadside random breath test site at Waterfall in the early hours of September 8. While under the regular limit of 0.05, Fuller was meant to have zero blood alcohol as a P-plater. Deputy chief magistrate Michael Allen on Thursday fined Fuller $880 and disqualified him from driving for four months, noting his early guilty pleas and his good future prospects. "I take the view you are a good decent young man who made a stupid mistake on that night," he said in the Downing Centre Local Court. Fuller's lawyer, Sam Macedone, said his client was a timber yard labourer who wants to become a carpenter. He lives with his stepfather and mother who supported him in court. She and Mick Fuller separated when their son was about three weeks old, Mr Macedone said. His client was brought up by his stepfather with whom he had "an amazing father/son relationship". The driving offence had created media attention because his biological father happened to be the police commissioner, Mr Macedone said. "He has had to wear all the headlines in that regard." The magistrate noted references speaking highly of Fuller, who was involved in charity work and had to put up with watching his sister and stepfather suffer potentially fatal illnesses. He recorded a conviction because of the need for "an unyielding message" to help ensure the safety of road users. Outside court, Mr Macedone told reporters other people who commit "an offence like this never get in the media at all". "He has to explain to a lot of friends why his father isn't who they thought his father was," he said. "But as he said 'I did the wrong thing, I'll wear what I have to wear'. That was part of the punishment I believe." Australian Associated Press